sh: Move main library bibfile to library root

With the switch from jabref/zotero/pubs to papis for library management,
We can now also have nested libraries. This allows me to have 'themed'
libraries in different sub-folders (e.g. one for my academic study, one
for my old university readings, one for computer science, and so on) and
still keep referring to their containing folder as a 'main'
comprehensive library.

As such I moved the library bibtex file into the main library folder and
let it be created from all sub-libraries.

sh/.config/sh/env

@@ -17,7 +17,7 @@ export LIBRARYROOT="${LIBRARYROOT:-$HOME/documents/library}"
 # the default bibtex file to work on
 # will change over time as primary projects change
 # basically functions as 'default library' variable
-export BIBFILE="${BIBFILE:-$LIBRARYROOT/academia/academia.bib}"
+export BIBFILE="${BIBFILE:-$LIBRARYROOT/library.bib}"
 
 # these are my personal 'important' application settings
 if exist nvim; then